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How to Insulate a Cathedral Ceiling in an Existing Home with Foam Insulation
Amanda Ringler

By: Amanda Ringler on February 25th, 2019

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How to Insulate a Cathedral Ceiling in an Existing Home with Foam Insulation

cathedral ceiling insulation  |  spray foam insulation  |  injection foam insulation

You’re tired of the air you pay to heat and cool escaping through your cathedral ceiling, so you’re ready to have foam insulation installed.

You know that foam is going to fix your problems, but you’re unclear on how the installation is going to go. Don’t sweat it, we’ve got you covered.

RetroFoam of Michigan has helped thousands of homeowners with their comfort and energy efficiency needs. With this experience, we know exactly how to insulate your cathedral ceiling in a way that you don’t have to worry about air leakage anymore.

We strive to educate homeowners, so in our continued efforts to get you all of the information you need, we are going to explain installing either spray foam or injection foam as your cathedral ceiling insulation.

How to Insulate a Cathedral Ceiling in an Existing Home

There are two methods to insulating a cathedral ceiling with foam insulation.cathedraldrill_Toned

You can either drill holes and inject the foam or cut panels and spray the foam. One method of installation may work better compared to the other. It really comes down to what you and your contractor decide is best for your project.

While the installation processes are different, the results are the same as both injection foam and spray foam create the air barrier you’re looking for to stop air leakage.

That doesn’t really specifically answer your question, so let’s really break this down.

How to Insulate a Cathedral Ceiling with Injection Foam

Insulating the cathedral ceiling of your home with injection foam can be done by drilling holes into the cavity on either side of the peak.

The holes would be drilled in the middle of each cavity, so the installer can run the hose from the top to the bottom to ensure the cavity is full. The existing fiberglass in the cathedral ceiling can stay put, as the injection foam will compress it as it fills the space.

Once the foam has been injected, the holes are plugged, and a rough patch of drywall mud is applied over the plugged hole.

How to Insulate a Cathedral Ceiling with Spray Foam

cathedralstrips_TonedInsulating the cathedral ceiling with spray foam requires a little more demo, but the installer is able to better see the foam expanding and filling the cavity.

Before the foam can be sprayed into the cavity, any existing insulation will need to be removed so the spray foam can adhere to the underside of the roof.

One- to two-foot strips would be cut through the middle of the stud cavities on either side of the peak. This way the installer can spray from the soffit up to the peak in each cavity.

Once the foam has been sprayed into the cavities, drywall is placed back over where the strips were cut and a rough patch of mud is spread over the seams.

Air Sealing Your Home

Whether the foam is injected or sprayed into your cathedral ceiling, you’ll notice a difference in the comfort level of your home.

No more air leaking through the roof. No more high energy bills.

Your home works as an entire system, so taking the jump to air seal the entire building envelope can make a huge difference. If you want to learn more about the benefits of foam insulation for the rest of your home, check out the Learning Center on our website.

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About Amanda Ringler

Amanda previously has worked as a breaking news and crime reporter, TV news producer, and editor in Flint and Detroit. Throughout her career as a journalist, she has won several awards from the Detroit Chapter of Society of Professional Journalists and the Michigan Press Association. As part of the RetroFoam of Michigan family, Amanda uses her experience as a journalist to write content that will help educate homeowners on the benefits of foam insulation. When Amanda isn’t writing, she’s spending time with her husband and rescued huskies. She also loves knitting, making art, cooking, and hosting dinner and a movie night for friends and family.